As Del showed you; it’s all in the shape and size of the Si sonar beams versus the QuadraBeam sonar beams. Since the Si beams are very thin front-to-rear and very wide left-to-right they can produce an image that has a lot of detail that also covers a wider area than the QuadraBeam can.
When you change the Transducer select menu from one setting to another, the unit will use a different part of programming for one sonar type versus another. Not only will sonar Views change but also associated menus will be shown or hidden as well.